166512089 has 4 divisors (see below), whose sum is σ = 166558224. Its totient is φ = 166465956.

The previous prime is 166512011. The next prime is 166512091. The reversal of 166512089 is 980215661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166512089 - 2⁸ = 166511833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166512589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17147 + ... + 25040.

It is an arithmetic number, because the mean of its divisors is an integer number (41639556).

Almost surely, 2^166512089 is an apocalyptic number.

It is an amenable number.

166512089 is a deficient number, since it is larger than the sum of its proper divisors (46135).

166512089 is an equidigital number, since it uses as much as digits as its factorization.

166512089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46134.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 166512089 is about 12903.9563312962. The cubic root of 166512089 is about 550.1510207874.

The spelling of 166512089 in words is "one hundred sixty-six million, five hundred twelve thousand, eighty-nine".